Unreal Engine 1 RTX Remix Render Device

Overview

This is a custom render device for the Unreal Engine, optimized for use with NVIDIA's RTX Remix. Built off of Chris Dohnal's D3D9Drv renderer and heavily modified to better support Remix.

Currently Supported Games

• Unreal Tournament (OldUnreal v469d and v436)
• Unreal (v226)
• Deus Ex (v1112fm)
• Nerf Arena Blast (v300)
• Rune (v107)
• Harry Potter Philosopher's Stone
• Harry Potter Chamber of Secrets

Requirements

• One of the supported games
• RTX Remix Runtime v0.5+ (Installed in System folder)

Installation

• Installation Tutorial video

1. Download the appropriate zip file from releases.

2. Navigate to the game's installation directory.

3. Extract the files into the System folder. (the RTX Remix d3d9.dll and .trex should be here too)

4. Configure the game to use the Direct3D 9 RTX Optimised render device in the menus.

   Or update the game's .ini configuration file (eg. UnrealTournament.ini) by changing these lines under the [Engine.Engine] section:

   [Engine.Engine]
   GameRenderDevice=D3D9DrvRTX.D3D9RenderDevice
   ...
   Render=D3D9DrvRTX.D3D9Render
   

Harry Potter 1/2 installation

For the Harry Potter games, the .ini files are located in the documents folder and they must be manually edited as described above as there is no render device selection menu.

• %USERPROFILE%\Documents\Harry Potter\HP.ini for Philosophers Stone
• %USERPROFILE%\Documents\Harry Potter II\Game.ini for Chamber of Secrets

Usage

After installation, start the game, and it should now be using the RTX Remix optimized render device.

Settings

Settings for the renderer are stored in D3D9DrvRTX.ini, they can be changed in this file and take effect after restarting the game. You can also change the settings in game by running the preferences command in the console and navigating to Rendering->Direct3D 9 RTX Optimised

The RTX specific options are listed here:

• LightMultiplier: Global light brightness multiplier.

• LightRadiusDivisor: The LightRadius is divided by this value before being exponentiated.

• LightRadiusExponent: LightRadius is raised to the power of this value before being multiplied with the brightness.

• EnableSkyBoxRendering: Enables rendering of the skybox zone (if one is found) before the main view.

• EnableSkyBoxAnchors: Enables the special mesh at the camera's position, generated for anchoring the skybox in remix.

• EnableHashTextures: Enables specially generated textures with a stable hash in place of procedurally generated ones.

  Hash textures (Help, some textures are pink mush!)

  UE1 makes use of textures that are generated procedurally at runtime, which means that the hash for them that Remix sees is not always the same, this makes replacing them difficult. To get around this issue, when EnableHashTextures is on, we generate a unique static texture that is used in place of the procedural one.

  Textures can be individually excluded from this option by adding their name into the D3D9DrvRTX_hash_tex_blacklist.txt file. To help in detemining which textures are affected, when a texture is replaced this way, a message is logged in the game's log (eg. UnrealTournament.log) that will give you the full name of the texture.

  Light formula

  The brightness of lights are calculated as follows:

  light.brightness * pow((light.radius / LightRadiusDivisor), LightRadiusExponent) * LightMultiplier * brightnessSetting

  This is to approximate the light radius cutoff effect of the regular renderer, which is not possible to achive with physically based lights. brightnessSetting is the value of the in game brightness slider * 2, where the slider's middle value (0.5) multiples light brighnesses by 1.0

Developer setup

You will need to have Visual Studio installed with the windows sdk, as well as the Direct3D 9 SDK.

For each game, copy an installation of that game into the installs. UT 469d for example would go in installs/install_ut469d, where the game code matches the names in sdks.

To set the current game, simply run the corresponding .bat file in scripts. This creates sdk and install directory symlinks to the appropriate folders in sdks and installs. The vs project is setup to use the sdk folder for headers and libs, and save the built dll into install/System

The BuildAll.py scripts executes each bat script in turn and builds and packages the result into the released .zip files.